The Yestertime Warning by Peter Cunningham

Set in a world where time travel is a closely guarded secret, the story follows a group of unlikely allies who discover a hidden conspiracy threatening the fabric of reality. As they navigate through different eras, they must decipher cryptic warnings from the past to prevent a catastrophic event that could alter history forever. With each twist and turn, the characters grapple with moral dilemmas and the consequences of their actions, ultimately learning that the past, present, and future are intricately connected in ways they never imagined.