TIMELOCK

Breakneck pacing and ecological earnestness supplant coherent storytelling in the over-the-top culmination of this time-travel trilogy. Jack and his pals have saved the oceans and the rainforests, and now he just wants a normal life. But that pesky Destiny can’t leave a “beacon of hope” alone. Soon Jack’s on the run again, this time to the ecologically devastated future, helping his warrior-Queen mother bust his father out of the Dark Lord’s dungeons. Whoops! Time to hurtle back to the present to save the Arctic ice cap from a genocidal cyborg! From ravaged, polluted wastelands to sublimely majestic glaciers, the settings are vivid and evocative. Jack is likable enough but does little to justify the universal devotion and awe he’s accorded. Secondary characters grate, coming off as sexist, sanctimonious or simply strange. The barrage of Too Much Stuff, intriguing in concept but seemingly pulled from nowhere to keep the plot moving, thunders to a ludicrous climax and bathetic epilogue, subverting any message of responsible environmental stewardship. Sheer fluff and nonsense, but if the first two are popular, this one will rocket off the shelves. (Science fiction. YA)